Datasheet TMC828, TMC829 (Microchip)

TCM828/TCM829 Switched Capacitor Voltage Converters Features Description
• Charge Pump in 5-Pin SOT-23 Package The TCM828/TCM829 devices are CMOS “charge- • >95% Voltage Conversion Efficiency pump” voltage converters in ultra-small, 5-Pin SOT-23 • Voltage Inversion and/or Doubling packages. They invert and/or double an input voltage which can range from +1.5V to +5.5V. Conversion • Low 50 µA (TCM828) Quiescent Current efficiency is typically >95%. Switching frequency is • Operates from +1.5V to +5.5V 12 kHz for the TCM828, and 35 kHz for the TCM829. • Up to 25 mA Output Current External component requirement is only two capacitors • Only Two External Capacitors Required (3.3 µF nominal) for standard voltage inverter applications. With a few additional components, a
Applications
positive doubler can also be built. All other circuitry, including control, oscillator and power MOSFETs, are • LCD Panel Bias integrated on-chip. Supply current is 50 µA (TCM828) • Cellular Phones and 115 µA (TCM829). • Pagers The TCM828 and TCM829 devices are available in a • PDAs, Portable Dataloggers 5-Pin SOT-23 surface mount package. • Battery-Powered Devices
Package Type Typical Application Circuit TCM828/TCM829 Voltage Inverter
SOT-23 C+ VIN INPUT C1
9
OUT 5 C+ 1
82
C-
/TCM 8
VIN 2
2 8
OUT V-
TCM
OUTPUT GND C- 3 4 GND C2
Ordering Information Temperature Part No. Package Range
TCM828ECT 5-Pin SOT-23 -40°C to +85°C TCM828VT 5-Pin SOT-23 -40°C to +125°C TCM829ECT 5-Pin SOT-23 -40°C to +85°C
Note:
5-Pin SOT-23 is equivalent to EIAJ SC-74A. © 2010 Microchip Technology Inc. DS21488B-page 1 Document Outline 1.0 Electrical Characteristics 2.0 Typical Characteristics FIGURE 2-1: Output Resistance vs. Supply Voltage. FIGURE 2-2: Output Resistance vs. Temperature. FIGURE 2-3: TCM828 – Output Current vs. Capacitance. FIGURE 2-4: TCM829 – Output Current vs. Capacitance. FIGURE 2-5: TCM828 – Output Voltage Ripple vs. Capacitance. FIGURE 2-6: TCM829 – Output Voltage Ripple vs. Capacitance. FIGURE 2-7: Supply Current vs. Supply Voltage. FIGURE 2-8: TCM828 – Pump Frequency vs. Temperature. FIGURE 2-9: TCM829 – Pump Frequency vs. Temperature. FIGURE 2-10: Output Voltage vs. Output Current. FIGURE 2-11: Efficiency vs. Output Current. 3.0 Pin Description TABLE 3-1: Pin Function Table 4.0 Detailed Description FIGURE 4-1: Ideal Switched Capacitor Charge Pump. 5.0 APPLICATIONS INFORMATION FIGURE 5-1: Ideal Switched Capacitor Model. FIGURE 5-2: Equivalent Output Resistance. TABLE 5-1: Output Resistance vs. C1 (ESR = 0.1W) TABLE 5-2: Output Voltage Ripple vs. C2 (ESR = 0.1W) IOUT 10mA FIGURE 5-3: Test Circuit. FIGURE 5-4: Cascading TCM828 or TCM829 Devices to Increase Output Voltage. FIGURE 5-5: Paralleling TCM828 or TCM829 Devices to Reduce Output Resistance. FIGURE 5-6: Combined Doubler and Inverter. FIGURE 5-7: High V– Load Current. 6.0 Packaging Information 6.1 Package Marking Information FIGURE 6-1: Component Taping Orientation for 5-Pin SOT-23 (EIAJ SC-74A) Devices. Corporate Office Atlanta Boston Chicago Cleveland Fax: 216-447-0643 Dallas Detroit Kokomo Toronto Fax: 852-2401-3431 Australia - Sydney China - Beijing China - Shanghai India - Bangalore Korea - Daegu Korea - Seoul Singapore Taiwan - Taipei Fax: 43-7242-2244-393 Denmark - Copenhagen France - Paris Germany - Munich Italy - Milan Spain - Madrid UK - Wokingham Worldwide Sales and Service Trademarks Worldwide Sales